Study of interacting electrons in graphene under the renormalized-ring-diagram approximation

Details Study of interacting electrons in graphene under the renormalized-ring-diagram approximation Study of interacting electrons in graphene under the renormalized-ring-diagram approximation

2007-05-18

arxiv.org/abs/0705.2752v1

Phys. Rev. B 76, 155401 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 13 figures

Scientific paper

10.1103/PhysRevB.76.155401

Using the tight-binding model with long-range Coulomb interactions between electrons, we study some of the electronic properties of graphene. The Coulomb interactions are treated with the renormalized-ring-diagram approximation. By self-consistently solving the integral equations for the Green function, we calculate the spectral density. The obtained result is in agreement with experimental observation. In addition, we also compute the density of states, the distribution functions, and the ground-state energy. Within the present approximation, we find that the imaginary part of the self-energy fixed at the Fermi momentum varies as quadratic in energy close to the chemical potential, regardless the system is doped or not. This result appears to indicate that the electrons in graphene always behave like a moderately correlated Fermi liquid.

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